The thyristor-controlled reactor (TCR) is used for AC voltage control on transmission lines and industrial busbars. It has a relatively simple main circuit and its performance depends very much on its control system. The phase-locked oscillator type of control system is now universally used for HVDC convertors, and is being introduced for the TCR. The form of this control described is of the 'zero-delay' type, without control filters or other lags, and gives freedom from harmonic instability and a good combination of stability at other frequencies, with fast response. Examples of applications are described briefly.
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